Study Of Tautomerism Research Articles

Study of tautomerism and geometrical isomerism in derivatives of carsonyl compounds containing nitrogen

Study of tautomerism and geometrical isomerism in derivatives of carsonyl compounds containing nitrogen

Study of tautomerism and geometrical isomerism in derivatives of carbonyl compounds containing nitrogen

1. The polarographic behavior of 24 phenylhydrazones and methylphenylhydrazones in methanol-water solutions has been examined over the pH range 5.8–9.2. 2. The polarographic behavior of the tautomeric forms of these compounds—the hydrazonic, the enhydrazinic, and the azo form — has been compared with the behavior of model substances. The characteristic features in the polarographic behavior of the tautomers have been disclosed. 3. Some preliminary conclusions have been drawn on the reduction mechanism of the tautomeric forms on a mercury electrode.

Acyl derivatives of hydroxylamine. VIII. A spectroscopic study of tautomerism of hydroxamic acids

Acyl derivatives of hydroxylamine. VIII. A spectroscopic study of tautomerism of hydroxamic acids

Nuclear magnetic resonance studies of tautomerism: loss of aromaticity in “ [formula omitted]”-hydroxy and amino anthraquinones

Nuclear magnetic resonance studies of tautomerism: loss of aromaticity in “ [formula omitted]”-hydroxy and amino anthraquinones

Studies of the tautomerism and geometrical isomerism of nitrogen-containing derivatives of carbonyl compounds I. Polarographic study of the transformations of some phenylhydrazones in methanol

1. The polarographic method was employed in a study of the tautomeric and stereoisomeric transformations in alcoholic solutions of the phenylhydrazones of acetone, methyl ethyl ketone, methyl isopropyl ketone, cyclohexanone and benzaldehyde; the ethylphenylhydrazone of acetone was also studied. 2. It was shown that in alcoholic solution phenylhydrazones are generally capable of existing in three tautomeric forms, each of which in turns can be present as $yn- and anti-isomers. On dissolution in alcohol the tautomeric equilibrium Is shifted to the side of the azo form. 3. The half-wave potentials of the tautomers and stereoisomers of the various phenylhydrazones were determined, and the energies of the reciprocal transformations were calculated from the data obtained. 4. It was established that the phenylhydrazones of acetone, methyl ethyl ketone, methyl isopropyl ketone and cyclohexanone and the ethylphenylhydrazone of acetone possess the enhydrazone structure in the free state.

Tautomerism and Elimination

About twenty years ago the outlook on theoretical problems connected with tautomerism was considerably enlarged by the proposal to regard tautomeric changes, for certain purposes, as internal analogues of additivereactions1; thus the study of ring-chain tautomerism developed as a direct consequence of this point of view. It is curious that the complementary and equally valid idea of regarding tautomeric change as an internal form of elimination seems never to have been explored. Consideration shows that it leads to many striking analogies and correlations. This note is confined to a single illustration chosen because it happens to be simply explicable in terms of the preceding communication,

A Study of Propyne-Allene Tautomerism. 1,3-Diphenylpropyne (Benzylphenylacetylene) and Related Compounds

A Study of Propyne-Allene Tautomerism. 1,3-Diphenylpropyne (Benzylphenylacetylene) and Related Compounds

125. Studies in keto-lactol tautomerism. Part V. The influence of methylcyclohexane rings on the tautomerism of δ-ketonic acids

125. Studies in keto-lactol tautomerism. Part V. The influence of methylcyclohexane rings on the tautomerism of δ-ketonic acids

XXIX.—Studies in keto-lactol tautomerism. Part IV. Chemistry of 5-acetyl-1 : 1 : 2-trimethylcyclo-pentane-2-carboxylic acid. Observations on the constitutions of the acid esters of camphoric acid, and a synthesis of homoepicamphor

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CI.—Studies in keto-lactol tautomerism. Part II. Influence of the cyclohexane ring on the tautomeric character of cyclohexane-1-acetone-1-malonic acid, a comparison with cyclopentane-1-acetone-1-malonic acid, and synthesis of the corresponding δ-keto-monobasic acids

CI.—Studies in keto-lactol tautomerism. Part II. Influence of the cyclohexane ring on the tautomeric character of cyclohexane-1-acetone-1-malonic acid, a comparison with cyclopentane-1-acetone-1-malonic acid, and synthesis of the corresponding δ-keto-monobasic acids

CCL.—Studies in keto-lactol tautomerism. Part III. Influence of bulky substituents on the tautomerism of α-carboxy-γ-acetyl-β-methyl-β-ethyl-butyric and -ββ-diethylbutyric acids

CCL.—Studies in keto-lactol tautomerism. Part III. Influence of bulky substituents on the tautomerism of α-carboxy-γ-acetyl-β-methyl-β-ethyl-butyric and -ββ-diethylbutyric acids

XXVIII.—Studies in keto-lactol tautomerism. Part I. Ring-chain tautomerism in α-carboxy-γ-acetyl-ββ-dimethylbutyric acid and a synthesis of γ-acetyl-ββ-dimethylbutyric acid

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Reviews-Spectrographic studies in tautomerism

Reviews-Spectrographic studies in tautomerism

XLVIII.—Spectrographic studies in tautomerism. The absorption curves of the ethyl esters of dibenzoylsuccinic acid

XLVIII.—Spectrographic studies in tautomerism. The absorption curves of the ethyl esters of dibenzoylsuccinic acid